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4 Stroke Bicycle Engines & Kits 4 stroke engine kits are great if you want reliability or do not want to mix your oil and gas. Learn from each other how to get the most out of your 4 stroke bicycle engine

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  #1  
Old 09-17-2016, 06:53 PM
jahanness jahanness is offline
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Join Date: Sep 2016
Location: vancouver
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Default What 4 stroke for my first build?!

Hey there, I'm looking to make my first build on this frame http://www.gasbike.net/collections/a...lt-in-gas-tank and i want to put a 4 stroke on thats over 50cc because I live in a very hilly area. I'm looking at the predator 79cc kit right now, but im still wondering if theres a better option out there. Any input or suggestions would be much appreciated.
Thanks
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  #2  
Old 09-17-2016, 09:16 PM
TheNecromancer13 TheNecromancer13 is offline
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Location: Portland, Oregon
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Default Re: What 4 stroke for my first build?!

Better option would be to use the 79cc, but not get the kit. The predator kits do not come with everything you need to build a bike, and what they do include is marked way up so the seller can make a profit. Also the predator kits have no instructions. If you want to build a predator bike, build it from scratch. I have made a tutorial on how to do this which can be found here: http://www.instructables.com/id/79cc...-From-Scratch/
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Old 10-04-2016, 02:39 PM
KCvale KCvale is offline
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Join Date: Feb 2010
Location: Phoenix,AZ
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Default Re: What 4 stroke for my first build?!

Quote:
Originally Posted by jahanness View Post
Hey there, I'm looking to make my first build on this frame http://www.gasbike.net/collections/a...lt-in-gas-tank
Ya, that frame is a gasbike cheap knock-off of the real Grubee Skyhawk frames, for example no rear disc mount.

Quote:
I want to put a 4 stroke on thats over 50cc because I live in a very hilly area. I'm looking at the predator 79cc kit right now,
but im still wondering if theres a better option out there.
Any input or suggestions would be much appreciated.
Thanks
Yes, there is a pretty good 'other option' now, well soon as I have a heath issue right now.

The 49cc or 53cc are enough to power you up to ~40mph and tackle hills and still maintain ~20mph because of the bike gears.

I modify a Skyhawk 4G to a 10G long shaft of my design to drop the engine output over the pedal systems sprockets.




The main 100T belt pulley is a freewheel, which means you have virtually no drag from the engine part even with the engine off when you pedal.



In short gears rock ;}
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Old 12-19-2016, 09:07 AM
bluedogeli bluedogeli is offline
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Join Date: May 2009
Location: ca.
Posts: 5
Default Re: What 4 stroke for my first build?!

how did you extend the output from trans to pilot bearing?
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  #5  
Old 12-21-2016, 10:56 AM
KCvale KCvale is offline
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Default Re: What 4 stroke for my first build?!

Quote:
Originally Posted by bluedogeli View Post
how did you extend the output from trans to pilot bearing?
I designed a new shaft and got it made ;-}
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Old 12-24-2016, 09:20 PM
bluedogeli bluedogeli is offline
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Join Date: May 2009
Location: ca.
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Default Re: What 4 stroke for my first build?!

Merry Christmas! Any suggestions on design and fabrication?
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